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Steel Making

The Packing Department
In Fig. 56 is shown the packing pots where the work is packe...

The Pyrometer And Its Use
In the heat treatment of steel, it has become absolutely nece...

Composition And Properties Of Steel
It is a remarkable fact that one can look through a dozen tex...

Hardening Carbon Steel For Tools
For years the toolmaker had full sway in regard to make of st...

Hardening High-speed Steel
In forging use coke for fuel in the forge. Heat steel slowly ...

Mushet And Bessemer
That Mushet was "used" by Ebbw Vale against Bessemer is, perh...

Instructions For Working High-speed Steel
Owing to the wide variations in the composition of high-speed...

Corrosion
This steel like any other steel when distorted by cold worki...

Effects Of Proper Annealing
Proper annealing of low-carbon steels causes a complete solu...

Carburizing By Gas
The process of carburizing by gas, briefly mentioned on page ...

Complete Calibration Of Pyrometers
For the complete calibration of a thermo-couple of unknown e...

Placing The Thermo-couples
The following illustrations from the Taylor Instrument Compan...

Carbon In Tool Steel
Carbon tool steel, or tool steel as it is commonly called, us...

Nickel
Nickel may be considered as the toughest among the non-rare a...

The Theory Of Tempering
Steel that has been hardened is generally harder and more br...

Phosphorus
Phosphorus is one of the impurities in steel, and it has been...

The Influence Of Size
The size of the piece influences the physical properties obta...

Liberty Motor Connecting Rods
The requirements for materials for the Liberty motor connecti...

An Automatic Temperature Control Pyrometer
Automatic temperature control instruments are similar to the ...

Machineability
Reheating for machine ability was done at 100 deg. less than ...



An Automatic Temperature Control Pyrometer






Category: PYROMETRY AND PYROMETERS

Automatic temperature control instruments are similar to the Brown
indicating high resistance pyrometer with the exception that the
pointer is depressed at intervals of every 10 sec. upon contact-making
devices. No current passes through the pointer which simply depresses
the upper contact device tipped with platinum, which in turn comes
in contact with the lower contact device, platinum-tipped, and the
circuit is completed through these two contacts. The current is very
small, about 1/10 amp., as it is only necessary to operate the relay
which in turn operates the switch or valve. A small motor is used to
depress the pointer at regular intervals. The contact-making device
is adjustable throughout the scale range of the instrument, and an
index pointer indicates the point on the instrument at which the
temperature is being controlled. The space between the two contacts
on the high and low side, separated by insulating material, is
equivalent to 1 per cent of the scale range. A control of temperature
is therefore possible within 1 per cent of the total scale range.
Figure 131 shows this attached to a small furnace.





Next: Pyrometers For Molten Metal

Previous: Brown Automatic Signaling Pyrometer



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